shabazmoqsud Ian's been busy on some other work lately. Anyway: can confirm that what you're seeing from time to time is a known bug. It's also purely a display bug, which as others have noted you can rectify easily by simply refreshing the page. Except in rare circumstances, you'll be the only one seeing it at any given time and other members will be seeing your member name displayed correctly.
On the other matter of the Best Answers button ... we're investigating.